Abstract
The fault-tolerant permanent magnet motor (FTPMM) drives are desired in electric ship propulsion systems. The winding inductance, the sinusoidal degree of the back electromotive force (back-EMF) waveform, and the total harmonic distortion (THD) of the cogging torque are the important factors that affect the operating performance of FTPMM drive. A performance optimization of a three-phase FTPMM by varying motor structural parameters is presented in this article. By analyzing mathematical formulas, notch parameters and permanent magnet size are designed optimally to obtain large winding self-inductance, good sinusoidal degree of back-EMF, and low THD of cogging torque. The finite element verification in Ansoft proves selected parameters reasonable. Finally, an experimental prototype motor is specifically built according to determined parameters; and good performances, magnetic isolation, and fault-tolerant capacity can be guaranteed.
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